METHOD FOR CONTROLLING THE USE OF A CONDITIONAL ACCESS CONTENT AND MULTIMEDIA UNIT FOR IMPLEMENTING SAID METHOD

• US 20110113492A1
• Filed: 06/19/2009
• Published: 05/12/2011
• Est. Priority Date: 06/20/2008
• Status: Active Grant

• Current Assignee: Nagravision SA (Kudelski SA)
• Original Assignee: Nagravision SA (Kudelski SA)
• Inventors: Dagaeff, Thierry, Desarzens, Philippe
• Granted Patent: US 8,578,505 B2
• Time in Patent Office: Days
• US Class Current: 726/27
• CPC Class Codes: H04H 60/14 Arrangements for conditional access to broadcast information or to broadcast-related services
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management
• CPC Class Codes: H04L 63/102 Entity profiles
• CPC Class Codes: H04L 63/104 Grouping of entities
• CPC Class Codes: H04L 67/30 Profiles
• CPC Class Codes: H04N 21/2541 Rights Management protecting software against unauthorised usage in a vending or licensing environment G06F21/10; security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/26603 for automatically generating descriptors from content, e.g. when it is not made available by its provider, using content analysis techniques
• CPC Class Codes: H04N 21/26606 for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/4532 involving end-user characteristics, e.g. viewer profile, preferences monitoring of user activities for profile generation for accessing a video database G06F16/739; user profiles in network data switching protocols H04L67/306; processing of user preferences or user profiles in wireless networks H04W8/18
• CPC Class Codes: H04N 21/4623 Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/4627 Rights management associated to the content security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/63345 by transmitting keys key distribution for secret or secure communication H04L9/08; network support of key management H04L63/06
• CPC Class Codes: H04N 21/83555 using a structured language for describing usage rules of the content, e.g. REL
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

The present invention concerns a method for controlling the use of a conditional access content (C0), said content being sent to a plurality of multimedia units (STB) connected to a management center (CG). The method comprises the steps of defining controlled content usage types; defining a set of usage rules (UR) for at least two controlled content usage types by setting condition values for these controlled content usage types; defining at least two content profiles (CP) by associating one usage rule of said at least two controlled content usage types; sending management messages containing the content profiles (CP) to at least a set of multimedia units (STB) linked to said management center; storing the content profiles (CP) in the concerned multimedia units; sending the conditional access content (C0), and joined sending of a control message (ECM) containing at least a means for determining the content profile (CP) that is to be linked to the content (C0); further to the reception by a multimedia unit of the encrypted content (C0) and of the corresponding control message (ECM), extracting the means for determining the content profile that is to be linked to the content; searching in the multimedia unit, the content profile corresponding to the means for determining the content profile that is to be linked to the content; and of using the content (C0) by the multimedia unit according to the usage rules contained in the content profile that is to be linked to the content. The invention further concerns a multimedia unit for implementing said method.

Claims

1. A method for controlling a use of a conditional access content by a multimedia unit, said content being sent to a plurality of multimedia units connected to a management center, said method comprising:

receiving management messages containing a plurality of content profiles to a plurality of multimedia units linked to said management center, each of the content profiles having an associated usage rule for at least two controlled content usage types;

storing the content profiles in the multimedia units;

receiving the conditional access content, and a control message containing at least information indicating a content profile that is to be linked to the content;

extracting the information indicating the content profile that is to be linked to the content;

accessing the content profile corresponding to the information indicating the content profile that is to be linked to the content;

using the content by the multimedia unit according to the usage rules contained in the content profile that is to be linked to the content.

2. The method according to claim 1, wherein the information indicating the content profile that is to be linked to the content contains a content profile identifier.

3. The method according to claim 1, wherein the information indicating the content profile that is to be linked to the content comprises a set of at least two pairs of content profile identifiers/user profile identifiers and wherein said method further comprises the steps of:

associating in the management center, each multimedia unit with a user profile;

sending to each multimedia unit, the corresponding user profile;

wherein the step of extracting the information indicating content profile comprises determining the pair of user profile identifier/content profile identifier such that the user profile identifier corresponds to the user profile of the multimedia unit;

and wherein the step of accessing the content profile corresponding to information indicating the content profile uses the content profile identifier of said pair of user profile identifier/content profile identifier.

4. The method according to claim 1, wherein the use of the content linked to the content profile relies on memorizing the content associated with the content profile in a memory of the multimedia unit.

5. The method according to claim 1, wherein the use of the content linked to the content profile relies on accessing said content.

6. The method according to claim 1, wherein said content profiles are sent to all the multimedia units connected to the management center.

7. The method according to claim 1, wherein the content profiles are sent in global entitlement management messages.

8. The method according to claim 3, wherein the user profiles are sent in unique or shared entitlement management messages.

9. The method according to claim 1, wherein the usage rules composing a content profile are separately sent with the content profile identifier in global entitlement management messages.

10. The method according to claim 9, wherein the multimedia unit recomposes the content profile by grouping the usage rules having the same content profile identifier.

11. The method according to claim 10, wherein the multimedia unit stores the recomposed content profile.

12. The method according to claim 9, wherein the multimedia unit stores the usage rules.

13. The method according to claim 12, wherein the multimedia unit recomposes the content profile when receiving the content profile identifier in the control message.

14. The method according to claim 1, wherein at least one condition value for at least one usage type is not defined among the usage rules.

15. The method according to claim 14, wherein the missing condition value for at least one usage type is transmitted in the control message.

16. The method according to claim 14, wherein multimedia units define the missing condition values for at least one usage type using a default set of values.

17. The method according to claim 16, wherein the said default set of values is sent to all multimedia units connected to the management center in global entitlement management messages.

23. A multimedia unit comprising means for implementing the method of claim 1.

18. A method for controlling the use of a conditional access content by a multimedia unit, said content being sent to a plurality of multimedia units connected to a management center, said method comprising:

receiving a plurality of content profile families to each of the concerned multimedia units, each of the content profile families including, a plurality of content profiles, each content profile having an associated usage rule for at least two controlled content usage types, each of the multimedia units being associated with a user profile, each user file being associated with a content profile of a content profile family;

storing the content profiles of each content profile family in the multimedia units;

receiving the conditional access content and a control message containing at least information indicating a content profile family associated with the content;

extracting the information indicating the content profile family associated with the content;

accessing, in the multimedia unit, the content profile family corresponding to the information indicating the content profile family associated with the content;

accessing in the multimedia unit a content profile to be linked to the content from among the content profiles of the content profile family accessed in the previous step;

using the content by the multimedia unit according to the usage rules contained in the content profile that is to be linked to the content.

19. The method according to claim 18, wherein the information indicating the content profile that is to be linked to the content contains a content profile identifier.

20. The method according to claim 18, wherein the use of the content linked to the content profile families relies on memorizing the content associated with the content profile in a memory of the multimedia unit.

21. The method according to claim 18, wherein the use of the content linked to the content profile families relies on accessing said content.

22. The method according to claim 18, wherein the content profiles of each family are sent in unique or shared entitlement management messages.

24. A multimedia unit comprising means for implementing the method of claim 18.